A098351 Multiplication table of the composites read by antidiagonals.

16, 24, 24, 32, 36, 32, 36, 48, 48, 36, 40, 54, 64, 54, 40, 48, 60, 72, 72, 60, 48, 56, 72, 80, 81, 80, 72, 56, 60, 84, 96, 90, 90, 96, 84, 60, 64, 90, 112, 108, 100, 108, 112, 90, 64, 72, 96, 120, 126, 120, 120, 126, 120, 96, 72, 80, 108, 128, 135, 140, 144, 140, 135, 128

Offset

1,1

Links

Table of n, a(n) for n=1..64.

Formula

T(n,k) = A002808(n)*A002808(k).

Example

16, 24, 32, 36, 40, 48, 56, 60, 64, 72,...
24, 36, 48, 54, 60, 72, 84, 90, 96,108,...
32, 48, 64, 72, 80, 96,112,120,128,144,...
36, 54, 72, 81, 90,108,126,135,144,162,...
40, 60, 80, 90,100,120,140,150,160,180,...
48, 72, 96,108,120,144,168,180,192,216,...

Crossrefs

Cf. A003991, A098350.

Sequence in context: A179370 A166675 A114405 * A206267 A325480 A205193

Adjacent sequences: A098348 A098349 A098350 * A098352 A098353 A098354

Keyword

nonn,tabl

Author

Douglas Stones (dssto1(AT)student.monash.edu.au), Sep 04 2004

Status

approved